Parker HDK-CNG Series Operating Manual

Contents

Parker HDK-CNG Series Operating Manual Manual pdf 38 page image

Notes for interrupted mains voltage38 HDK-CNG_EN_03_2016Shutting down and restarting the dryerIn the following cases, the dryer must be fully shut down and depressurised: In the event of an emergency or malfunction For maintenance For disassemblyFormation of an explosive gas mixture! An explosive mixture of gases can form if gas escapes while oxygenenters the dryer.Risk of injury from escaping compressed air!Never remove any parts of the dryer, or manipulate the same in any way,for as long as the plant is still pressurised! Suddenly escapingcompressed air might cause serious injuries.Before carrying out any work on the dryer, first depressurise the plant.On no account place the dryer into service or take the dryer out of servicewithout inerting it beforehand!Together with air, natural gas can form an explosive gas mixture andtherefore poses a considerable danger. An explosive atmosphere canbuild up especially during commissioning and when replacing the dryingagent. To avoid this, the dryer must be purged with inert gas both beforeplacing into service well as before taking out of service (e.g. beforemaintenance). You will find information on inerting on Page 15.Notes for interrupted mains voltageNote the following instructions in the event of the power supply to the dryer beingcut unexpectedly.In the event of a power failure or of the dryer being switched off using the On/Offswitch, any main valve open then closes, resulting in pressure at the delivery side of the dryer rising while the compressor is running(up to the controlled shutdown point of the compressor), vessel pressure (without startup fixture) dropping when natural gas outlet valveis opened, if natural gas is being sourced from the grid, no further natural gas enters the downstream natural gas system.Note:As soon as the dryer is switched on again, the programme continuesthe cycle from the point at which it has been stopped.